Which Type of Data Is Used in Relational Database?


Larry Thompson

A relational database is a type of database that organizes data into tables, which are connected through relationships. Each table consists of rows and columns, where each row represents a record and each column represents a specific attribute or field. In a relational database, different types of data can be used to represent various aspects of the real-world entities being modeled.

Character Data

Character data is used to store alphanumeric values such as names, addresses, and descriptions. It can include letters, numbers, symbols, and spaces.

In relational databases, character data is typically represented using the CHAR or VARCHAR data types. The CHAR type stores fixed-length strings, while the VARCHAR type stores variable-length strings.

Numeric Data

Numeric data is used to store numerical values such as quantities, prices, and ratings. It includes integers (whole numbers) and floating-point numbers (numbers with decimal places).

Relational databases provide various numeric data types like INTEGER, FLOAT, and DECIMAL. These types allow for efficient mathematical calculations and comparisons between numeric values.

Date and Time Data

Date and time data is used to store temporal information such as dates, times of day, or both. Relational databases offer specific date and time data types like DATE, TIMESTAMP, and DATETIME. These types enable storing and manipulating dates and times accurately within the database.

Boolean Data

Boolean data is used to represent logical values like true or false. It is commonly used in relational databases to indicate the presence or absence of a certain condition. The boolean data type in a relational database is typically represented as BIT, BOOL, or BOOLEAN.

Binary Data

Binary data is used to store non-textual information such as images, audio files, or documents. Relational databases provide binary data types like BLOB (Binary Large Object) or VARBINARY (Variable-length Binary) to store and retrieve binary data efficiently.

List of commonly used data types in relational databases:

  • CHAR: Stores fixed-length character strings.
  • VARCHAR: Stores variable-length character strings.
  • INTEGER: Stores whole number values.
  • FLOAT: Stores floating-point number values.
  • DATETIME: Stores date and time values.
  • BIT/BOOL/BOOLEAN: Stores true/false or logical values.
  • BLOB/VARBINARY: Stores binary data such as images or documents.

When designing a relational database, it is essential to choose the appropriate data types for each attribute to ensure efficient storage and retrieval of data. It is crucial to understand the different types of data that can be used in relational databases to accurately represent the real-world entities being modeled.

In conclusion, relational databases support various types of data including character, numeric, date and time, boolean, and binary. By selecting the most suitable data type for each attribute, developers can effectively store and manage diverse sets of information within a relational database system.

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